protected internal sealed override ReplicationOperation PrepareReplicationOperation(StatefulServiceExecutionContext executionContext, ReplicationOperationType type, IEnumerable <Replicable> replicables, IDictionary <string, string> operationMetadata)
{
if (this.IsDisposed)
{
AppTrace.TraceMsg(TraceLogEventType.Information, "StatefulServiceReplicaT.PrepareReplicationOperation", "PrepareReplicationOperation called after service was disposed");
return(null);
}
ReplicationOperation replicationOperation = null;
if (type == ReplicationOperationType.Replicate)
{
StatefulProgramInstance instance = this.instanceManager.GetInstance(StatefulProgramInstance.CurrentInstanceId);
if (instance == null)
{
AppTrace.TraceMsg(TraceLogEventType.Error, "StatefulServiceReplicaT.PrepareReplicationOperation", "Could not find StatefulProgramInstance with id '{0}'", StatefulProgramInstance.CurrentInstanceId);
throw new InvalidOperationException("Replication needs to be triggered in context of a program instance.");
}
IEnumerable <Replicable> attributedReplicables = instance.CollectAttributedReplicableMembers(replicables);
if (attributedReplicables != null)
{
replicables = Enumerable.Concat(replicables, attributedReplicables);
}
instance.SetContextInstanceId(replicables);
IEnumerable <Replicable> invalidReplicables;
if (!instance.ValidateReplicablesMapToTypeMembers(replicables, out invalidReplicables))
{
string missingReplicables = StatefulProgramInstance.GetReplicablesString(invalidReplicables);
StringBuilder error = new StringBuilder();
error.AppendFormat("Replication cannot be triggered as following members were not found in instance of type '{0}'.", instance.TypeInfo.ReplicableType.FullName);
error.AppendLine(missingReplicables.ToString());
AppTrace.TraceMsg(TraceLogEventType.Information, "StatefulServiceReplicaT.PrepareReplicationOperation", error.ToString());
throw new InvalidOperationException(error.ToString());
}
// TODO: When we make Replicable name to be IComparable, we can remove the ToString call from here.
replicationOperation = new ReplicationOperation(
type,
new List <Replicable>()
{
new Replicable <StatefulProgramInstance>(instance.Id.ToString(), new StatefulProgramInstance(this, instance.Id, instance.TypeInfo.ReplicableType, instance.InitializationParams, replicables, instance.Singleton))
},
operationMetadata);
}
else if (type == ReplicationOperationType.Copy)
{
ItemCollection <IComparable, StatefulProgramInstance> instances;
using (this.instanceManager.GetInstances(LockPermission.Read, out instances))
{
List <Replicable <StatefulProgramInstance> > replicablesToCopy = new List <Replicable <StatefulProgramInstance> >();
foreach (StatefulProgramInstance instance in instances)
{
// TODO: When we make Replicable name to be IComparable, we can remove the ToString call from here.
replicablesToCopy.Add(new Replicable <StatefulProgramInstance>(instance.Id.ToString(), instance));
}
replicationOperation = new ReplicationOperation(
type,
replicablesToCopy,
operationMetadata);
}
}
if (replicationOperation == null)
{
replicationOperation = new ReplicationOperation(type, replicables, operationMetadata);
}
return(replicationOperation);
}
